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Jade is about an 8 on the mohs scale but it shouldn't be hard on a DMT. When I lapped my Beryl which is about the same hardness I used a Shapton lapping plate with Silicon carbide grit. It was slow...

When you start getting into Jadeite you have to be careful because it grades into a semi-precious gem which rivals what a top class Japanese finisher could cost. Usually the more common stuff is...

True Jade is Jadeite and is harder than nephrite and is also very expensive. A piece large enough for use as a hone will be quite an expense. I don't see it as a hone medium to justify it over others...